JPH0766611B2 - Recording or playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a recording or reproducing apparatus using a flexible disk sheet as a recording medium, and in particular, recording for stabilizing a head touch using an air flow generated by rotation of the sheet. Or, it relates to a reproducing device.

[Conventional technology]

Generally, in the recording or reproducing apparatus as described above, when the recording or reproducing head (hereinafter abbreviated as head) is brought close to a disk that rotates at a high speed, the head and the disk face each other due to the airflow generated by the rotation of the disk. The state cannot be maintained stably and satisfactorily, resulting in a drawback that the recording or reproducing performance is deteriorated.

In order to solve this, in recent years, a stabilizing member is provided on the opposite side of the head through a disc, as will be described later with reference to FIG. 1, so that the air flow generated by the disc is not only generated between the head and the disc but also the stabilizing member and the disc. There is an effort to keep the head and disk facing each other stably and satisfactorily.

In FIG. 6, 1 is a flexible recording medium.
A disk, which is, for example, a magnetic disk, has a center core 2 made of plastic, for example, attached to the center thereof, and is attached to the spindle 3a of the disk rotation motor 3 at the center hole 2a of the center core 2 as shown in FIG. It is rotated at a predetermined speed (for example, 3,600 rpm in the case of a still image recording or reproducing device) in the direction of arrow A in the drawing. A recording or reproducing head 4 is, for example, a magnetic head, which is supported by a head moving table 7 (FIG. 7).
As a result, the disk 1 is moved in the radial direction as indicated by arrow B in the figure. As a result, the disk 1
Concentric or spiral recording tracks are formed on the recording surface. As described above, the reference numeral 5 designates a stabilizing member which is provided in a relationship facing the head 4 through the disk 1 for the purpose of stabilizing the disk 1 in the portion passing through the head 4, which will be described in detail in FIG. As shown in the drawing, in order to avoid the collision with the head, a concave groove portion 5c having a rectangular cross section with a constant opening width corresponding to the movement path of the head 4 in the direction of arrow B in FIG. The disk facing surface is divided into an upstream facing surface 5a and a downstream facing surface 5b in the rotation direction A of the disk 1 with a groove 5c as a boundary. 6 is a back plate which is provided as necessary, and has a long hole 6a,
The head 4 projects to the disk 1 side through the elongated hole 6a.

[Problems to be Solved by the Invention]

Now, the stabilizing member 5 described above is closely opposed to the upper surface of the disk 1, that is, the surface opposite to the recording surface, as shown in FIG. Slightly protruding into the concave groove portion 5c of the
It is made to project and face the recording surface of the disk 1 so as to be at the same level as a and 5b, and the back plate 6 faces the recording surface of the disk 1 at a distance larger than that of the stabilizing member 5. To be made.

When the disk 1 is rotated in the direction of arrow A in such a state, the disk 1 is affected by the airflow accompanying the rotation of the disk 1.
A positive pressure is generated between the stabilizing member 5 and the upstream facing surface 5a of the stabilizing member 5, and the disk 1 is pushed down in this portion, while a negative pressure is generated between the downstream facing surface 5b and the disk 1. However, a phenomenon occurs in which is attracted to the side of the stabilizing member 5 against its rigidity. As a result, as shown in FIG. 7, the downstream facing surface 5b of the stabilizing member 5 and the disk 1 easily come into contact with each other,
When they contact each other, stabilization of the facing state of the head 4 and the disk 1 is hindered, and the abrasive (eg, SiO ₂ , TiO ₂ etc.) contained in the binder in the magnetic layer of the disk 1 is a stable member. A situation occurs in which the opposite surface 5b of 5 is scratched. Then, the abrasive which is peeled off from the disk 1 by contact and adsorbed on the scratches of the stabilizing member 5 causes an abnormal load on the motor 3 for rotating the disk 1 to deteriorate the surface of the stabilizing member 5, and the servo is normally operated. May not work. Further, the abrasive adsorbed on the stabilizing member 5 further promotes the exfoliation of the abrasive contained in the binder in the magnetic layer of the disk 1, and it goes around the head 4 to accelerate the wear of the head 4. It also happens.

All of these phenomena are caused by the contact between the disk 1 and the stabilizing member 5 caused by the negative pressure.

The present invention has been made in view of such circumstances, and it is possible to maintain the facing state of the head and the flexible disk in a stable and good manner by simple means, and there is little risk of damage to the stabilizing member and the disk. It is intended to provide a recording or reproducing device provided with a stabilizing member.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a recording or reproducing apparatus capable of stably and satisfactorily maintaining the facing state of a head and a flexible disk with a simple means and preventing damage to the stabilizing member and the disk. And

[Means for solving problems]

In order to achieve such an object, according to the present invention, a recording or reproducing head that is movable in the radial direction of a flexible disk is provided so as to face the head through the disk, and a moving path of the head is provided. In a recording or reproducing device provided with a disk stabilizing member having a corresponding groove portion,
Near the concave groove portion of the stabilizing member, and on each of the upstream side and the downstream side in the rotation direction of the disk, a slope is formed which is inclined toward the bottom of the concave groove portion, and at least one of the slopes is The width in the disc rotation direction is formed so that the inner peripheral side is wider than the outer peripheral side of the disk.

[Action]

With such a configuration, positive pressure of a predetermined level is generated by the upstream and downstream slopes near the concave groove of the stabilizing member, and the positive pressure level is made different between the inner and outer circumferences of the disk. The optimum positive pressure level can be generated according to the deformation of the disk, and the distance between the head and the seat is stabilized.

〔Example〕

First, FIG. 1 is a perspective view of a disk-opposing surface of a stabilizing member according to an embodiment of the present invention as seen obliquely from above, and FIG. 2 is a state in which the stabilizing member is incorporated in an apparatus. In the figure, arrow A indicates the rotation direction of the disk 1, and C indicates the direction of the center core 2.

The stabilizing member 51 shown here is adjacent to the concave groove portion on the disk facing surface 51a on the upstream side in the rotating direction of the disk 1 with the concave groove portion 51c for escaping the head 4 as a boundary, that is, adjacent to the concave groove portion 51c here. A positive pressure generating slope 51f is provided so as to be inclined along the upstream ridgeline 51g and toward the concave groove portion 51c. On the other hand, the downstream disk facing surface 51
In b, a slope 51d for generating a positive pressure is provided in the vicinity of the recessed groove portion 51c, that is, here adjacent to the recessed groove portion 51c so as to be inclined along the downstream side ridge line 51e and toward the recessed groove portion 51c. ing. The slope 51f generates a proper level of positive pressure between the disk 1 and a portion of the disk 1 that passes through the slope 51f when the disk 1 rotates in the direction of the arrow, and prevents contact with the disk as shown in FIG. In order to make a required acute angle, that is, an acute angle at which a required positive pressure can be obtained at a predetermined rotation speed of the disk 1, with respect to the portion of the disk 1 that passes through the slope 51f in the traveling direction thereof. It is formed with a predetermined inclination angle based on the deformed shape of the disk 1 in the portion passing through the slope 51f.

Similarly, in order to generate a positive pressure between the slope 51d and the disc 1 in the portion passing through the slope 51d, as shown in FIG. The deformed shape of the portion of the disc 1 that passes through the slope 51d is formed so that a substantially acute angle is formed in the traveling direction thereof, that is, an acute angle is obtained so that the required positive pressure is obtained at a predetermined rotation speed of the disc 1. It is originally formed with a predetermined inclination angle.

According to the stabilizing member 51 having the above structure, when the disc 1 is rotated in FIG. 2, an appropriate positive pressure is generated by the slope 51f on the upstream side and a positive pressure is generated by the slope 51d on the downstream side. The disk is lower in the figure, that is, the stabilizing member 51.
It will be pushed away from, and the danger of contact will be eliminated on both the upstream and downstream sides. In this case, the positive pressure acts on the disk 1 at both upper and downstream end portions of the concave groove portion 51c of the disk 1, that is, at a portion where the deformation of the head portion 4 due to protrusion of the head 4 is at a critical point. It becomes possible to more effectively achieve the prevention of contact.

FIG. 3 shows a case where a disk-opposing surface of a stabilizing member according to another embodiment of the present invention is viewed obliquely from above.

When positive pressure is to be more positively obtained on the upstream side in the disk rotation direction, the entire surface of the upstream disk opposing surface may be formed with a positive pressure generating slope 52f as shown in FIG.

As yet another embodiment, as shown in FIG. 4, the head relief recessed groove portion 53 is formed so that the opening width in the disk center side, that is, the direction of the arrow c is larger than the opening width in the outer peripheral side of the disk.
As for the stabilizing member 53 having c, the positive pressure can be positively obtained on the upstream side by providing the positive pressure generating inclined surface 53f on the upstream side. In this case, the disk is the center
The inner circumference of the disk, even if the core receives uneven tension
A gear gap between the disk stabilizing members that is stable on the outer periphery can be obtained.

Further, as shown in FIG. 5, in order to make the force due to the positive pressure on the downstream side substantially uniform on the inner peripheral side and the outer peripheral side of the disk, the force is increased as it goes in the c direction, and the upstream inclined surface is formed.
54f may be provided.

〔effect〕

As described above, in the disk rotation direction of the stabilizing member, a slope for generating a positive pressure is provided near the head relief groove on the downstream side in the vicinity of the head relief groove, and at least one of the slopes rotates. The width in the direction is made wider so that the inner circumference side is wider than the outer circumference side of the disk, and the level of suppression generated is made different, so that the inner and outer circumferences of the disk match the deformation when the head actually contacts the flexible disk. By optimizing the level of positive pressure to be generated, the contact relationship between the head and disk can be maintained more stably, and the flexible disk during rotation is stabilized without contact with the stabilizing member, eliminating uneven rotation of the sheet. It has the effect of stabilizing the contact between the head and the sheet.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a stabilizing member of the present invention, and FIG. 2 is a longitudinal sectional view showing an embodiment of a head member of the present invention,
3, 4 and 5 are perspective views showing another embodiment of the present invention, FIG. 6 is a perspective view showing an embodiment of a recording apparatus using a conventional stabilizing member, and FIG. FIG. 8 is a vertical cross-sectional view of a recording apparatus using a conventional stabilizing member, which is near a head. Reference numeral 51 is a stabilizing member, 6 is a back plate, 1 is a flexible disk, and 4 is a head.

Claims (1)

[Claims] 1. A recording or reproducing head which is movable in a radial direction of a flexible disk, and is provided so as to face the head through the disk.
In a recording or reproducing apparatus provided with a disk stabilizing member having a concave groove portion corresponding to the moving path of the head, in the vicinity of the concave groove portion of the stabilizing member and on both the upstream side and the downstream side in the rotating direction of the disk. A sloped surface inclined toward the bottom of the groove is formed, and at least one of the sloped surfaces is formed such that the width in the disk rotation direction is wider on the inner peripheral side than on the outer peripheral side. A recording or reproducing device characterized by the above.